463 lines
11 KiB
C
463 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* PTP 1588 clock support - sysfs interface.
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*
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* Copyright (C) 2010 OMICRON electronics GmbH
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* Copyright 2021 NXP
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*/
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#include <linux/capability.h>
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#include <linux/slab.h>
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#include "ptp_private.h"
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static ssize_t clock_name_show(struct device *dev,
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struct device_attribute *attr, char *page)
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{
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struct ptp_clock *ptp = dev_get_drvdata(dev);
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return snprintf(page, PAGE_SIZE-1, "%s\n", ptp->info->name);
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}
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static DEVICE_ATTR_RO(clock_name);
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#define PTP_SHOW_INT(name, var) \
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static ssize_t var##_show(struct device *dev, \
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struct device_attribute *attr, char *page) \
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{ \
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struct ptp_clock *ptp = dev_get_drvdata(dev); \
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return snprintf(page, PAGE_SIZE-1, "%d\n", ptp->info->var); \
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} \
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static DEVICE_ATTR(name, 0444, var##_show, NULL);
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PTP_SHOW_INT(max_adjustment, max_adj);
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PTP_SHOW_INT(n_alarms, n_alarm);
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PTP_SHOW_INT(n_external_timestamps, n_ext_ts);
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PTP_SHOW_INT(n_periodic_outputs, n_per_out);
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PTP_SHOW_INT(n_programmable_pins, n_pins);
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PTP_SHOW_INT(pps_available, pps);
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static ssize_t extts_enable_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct ptp_clock *ptp = dev_get_drvdata(dev);
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struct ptp_clock_info *ops = ptp->info;
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struct ptp_clock_request req = { .type = PTP_CLK_REQ_EXTTS };
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int cnt, enable;
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int err = -EINVAL;
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cnt = sscanf(buf, "%u %d", &req.extts.index, &enable);
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if (cnt != 2)
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goto out;
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if (req.extts.index >= ops->n_ext_ts)
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goto out;
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err = ops->enable(ops, &req, enable ? 1 : 0);
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if (err)
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goto out;
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return count;
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out:
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return err;
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}
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static DEVICE_ATTR(extts_enable, 0220, NULL, extts_enable_store);
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static ssize_t extts_fifo_show(struct device *dev,
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struct device_attribute *attr, char *page)
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{
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struct ptp_clock *ptp = dev_get_drvdata(dev);
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struct timestamp_event_queue *queue = &ptp->tsevq;
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struct ptp_extts_event event;
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unsigned long flags;
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size_t qcnt;
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int cnt = 0;
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memset(&event, 0, sizeof(event));
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if (mutex_lock_interruptible(&ptp->tsevq_mux))
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return -ERESTARTSYS;
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spin_lock_irqsave(&queue->lock, flags);
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qcnt = queue_cnt(queue);
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if (qcnt) {
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event = queue->buf[queue->head];
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queue->head = (queue->head + 1) % PTP_MAX_TIMESTAMPS;
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}
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spin_unlock_irqrestore(&queue->lock, flags);
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if (!qcnt)
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goto out;
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cnt = snprintf(page, PAGE_SIZE, "%u %lld %u\n",
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event.index, event.t.sec, event.t.nsec);
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out:
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mutex_unlock(&ptp->tsevq_mux);
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return cnt;
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}
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static DEVICE_ATTR(fifo, 0444, extts_fifo_show, NULL);
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static ssize_t period_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct ptp_clock *ptp = dev_get_drvdata(dev);
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struct ptp_clock_info *ops = ptp->info;
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struct ptp_clock_request req = { .type = PTP_CLK_REQ_PEROUT };
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int cnt, enable, err = -EINVAL;
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cnt = sscanf(buf, "%u %lld %u %lld %u", &req.perout.index,
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&req.perout.start.sec, &req.perout.start.nsec,
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&req.perout.period.sec, &req.perout.period.nsec);
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if (cnt != 5)
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goto out;
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if (req.perout.index >= ops->n_per_out)
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goto out;
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enable = req.perout.period.sec || req.perout.period.nsec;
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err = ops->enable(ops, &req, enable);
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if (err)
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goto out;
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return count;
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out:
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return err;
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}
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static DEVICE_ATTR(period, 0220, NULL, period_store);
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static ssize_t pps_enable_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct ptp_clock *ptp = dev_get_drvdata(dev);
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struct ptp_clock_info *ops = ptp->info;
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struct ptp_clock_request req = { .type = PTP_CLK_REQ_PPS };
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int cnt, enable;
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int err = -EINVAL;
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if (!capable(CAP_SYS_TIME))
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return -EPERM;
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cnt = sscanf(buf, "%d", &enable);
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if (cnt != 1)
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goto out;
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err = ops->enable(ops, &req, enable ? 1 : 0);
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if (err)
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goto out;
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return count;
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out:
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return err;
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}
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static DEVICE_ATTR(pps_enable, 0220, NULL, pps_enable_store);
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static int unregister_vclock(struct device *dev, void *data)
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{
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struct ptp_clock *ptp = dev_get_drvdata(dev);
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struct ptp_clock_info *info = ptp->info;
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struct ptp_vclock *vclock;
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u32 *num = data;
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vclock = info_to_vclock(info);
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dev_info(dev->parent, "delete virtual clock ptp%d\n",
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vclock->clock->index);
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ptp_vclock_unregister(vclock);
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(*num)--;
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/* For break. Not error. */
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if (*num == 0)
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return -EINVAL;
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return 0;
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}
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static ssize_t n_vclocks_show(struct device *dev,
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struct device_attribute *attr, char *page)
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{
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struct ptp_clock *ptp = dev_get_drvdata(dev);
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ssize_t size;
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if (mutex_lock_interruptible(&ptp->n_vclocks_mux))
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return -ERESTARTSYS;
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size = snprintf(page, PAGE_SIZE - 1, "%u\n", ptp->n_vclocks);
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mutex_unlock(&ptp->n_vclocks_mux);
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return size;
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}
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static ssize_t n_vclocks_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct ptp_clock *ptp = dev_get_drvdata(dev);
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struct ptp_vclock *vclock;
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int err = -EINVAL;
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u32 num, i;
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if (kstrtou32(buf, 0, &num))
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return err;
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if (mutex_lock_interruptible(&ptp->n_vclocks_mux))
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return -ERESTARTSYS;
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if (num > ptp->max_vclocks) {
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dev_err(dev, "max value is %d\n", ptp->max_vclocks);
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goto out;
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}
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/* Need to create more vclocks */
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if (num > ptp->n_vclocks) {
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for (i = 0; i < num - ptp->n_vclocks; i++) {
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vclock = ptp_vclock_register(ptp);
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if (!vclock)
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goto out;
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*(ptp->vclock_index + ptp->n_vclocks + i) =
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vclock->clock->index;
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dev_info(dev, "new virtual clock ptp%d\n",
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vclock->clock->index);
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}
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}
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/* Need to delete vclocks */
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if (num < ptp->n_vclocks) {
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i = ptp->n_vclocks - num;
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device_for_each_child_reverse(dev, &i,
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unregister_vclock);
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for (i = 1; i <= ptp->n_vclocks - num; i++)
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*(ptp->vclock_index + ptp->n_vclocks - i) = -1;
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}
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if (num == 0)
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dev_info(dev, "only physical clock in use now\n");
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else
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dev_info(dev, "guarantee physical clock free running\n");
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ptp->n_vclocks = num;
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mutex_unlock(&ptp->n_vclocks_mux);
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return count;
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out:
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mutex_unlock(&ptp->n_vclocks_mux);
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return err;
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}
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static DEVICE_ATTR_RW(n_vclocks);
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static ssize_t max_vclocks_show(struct device *dev,
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struct device_attribute *attr, char *page)
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{
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struct ptp_clock *ptp = dev_get_drvdata(dev);
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ssize_t size;
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size = snprintf(page, PAGE_SIZE - 1, "%u\n", ptp->max_vclocks);
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return size;
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}
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static ssize_t max_vclocks_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct ptp_clock *ptp = dev_get_drvdata(dev);
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unsigned int *vclock_index;
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int err = -EINVAL;
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size_t size;
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u32 max;
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if (kstrtou32(buf, 0, &max) || max == 0)
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return -EINVAL;
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if (max == ptp->max_vclocks)
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return count;
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if (mutex_lock_interruptible(&ptp->n_vclocks_mux))
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return -ERESTARTSYS;
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if (max < ptp->n_vclocks)
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goto out;
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size = sizeof(int) * max;
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vclock_index = kzalloc(size, GFP_KERNEL);
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if (!vclock_index) {
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err = -ENOMEM;
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goto out;
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}
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size = sizeof(int) * ptp->n_vclocks;
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memcpy(vclock_index, ptp->vclock_index, size);
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kfree(ptp->vclock_index);
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ptp->vclock_index = vclock_index;
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ptp->max_vclocks = max;
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mutex_unlock(&ptp->n_vclocks_mux);
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return count;
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out:
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mutex_unlock(&ptp->n_vclocks_mux);
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return err;
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}
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static DEVICE_ATTR_RW(max_vclocks);
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static struct attribute *ptp_attrs[] = {
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&dev_attr_clock_name.attr,
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&dev_attr_max_adjustment.attr,
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&dev_attr_n_alarms.attr,
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&dev_attr_n_external_timestamps.attr,
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&dev_attr_n_periodic_outputs.attr,
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&dev_attr_n_programmable_pins.attr,
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&dev_attr_pps_available.attr,
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&dev_attr_extts_enable.attr,
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&dev_attr_fifo.attr,
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&dev_attr_period.attr,
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&dev_attr_pps_enable.attr,
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&dev_attr_n_vclocks.attr,
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&dev_attr_max_vclocks.attr,
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NULL
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};
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static umode_t ptp_is_attribute_visible(struct kobject *kobj,
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struct attribute *attr, int n)
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{
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struct device *dev = kobj_to_dev(kobj);
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struct ptp_clock *ptp = dev_get_drvdata(dev);
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struct ptp_clock_info *info = ptp->info;
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umode_t mode = attr->mode;
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if (attr == &dev_attr_extts_enable.attr ||
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attr == &dev_attr_fifo.attr) {
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if (!info->n_ext_ts)
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mode = 0;
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} else if (attr == &dev_attr_period.attr) {
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if (!info->n_per_out)
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mode = 0;
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} else if (attr == &dev_attr_pps_enable.attr) {
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if (!info->pps)
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mode = 0;
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} else if (attr == &dev_attr_n_vclocks.attr ||
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attr == &dev_attr_max_vclocks.attr) {
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if (ptp->is_virtual_clock)
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mode = 0;
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}
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return mode;
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}
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static const struct attribute_group ptp_group = {
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.is_visible = ptp_is_attribute_visible,
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.attrs = ptp_attrs,
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};
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const struct attribute_group *ptp_groups[] = {
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&ptp_group,
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NULL
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};
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static int ptp_pin_name2index(struct ptp_clock *ptp, const char *name)
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{
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int i;
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for (i = 0; i < ptp->info->n_pins; i++) {
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if (!strcmp(ptp->info->pin_config[i].name, name))
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return i;
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}
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return -1;
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}
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static ssize_t ptp_pin_show(struct device *dev, struct device_attribute *attr,
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char *page)
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{
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struct ptp_clock *ptp = dev_get_drvdata(dev);
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unsigned int func, chan;
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int index;
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index = ptp_pin_name2index(ptp, attr->attr.name);
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if (index < 0)
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return -EINVAL;
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if (mutex_lock_interruptible(&ptp->pincfg_mux))
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return -ERESTARTSYS;
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func = ptp->info->pin_config[index].func;
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chan = ptp->info->pin_config[index].chan;
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mutex_unlock(&ptp->pincfg_mux);
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return snprintf(page, PAGE_SIZE, "%u %u\n", func, chan);
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}
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static ssize_t ptp_pin_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct ptp_clock *ptp = dev_get_drvdata(dev);
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unsigned int func, chan;
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int cnt, err, index;
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cnt = sscanf(buf, "%u %u", &func, &chan);
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if (cnt != 2)
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return -EINVAL;
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index = ptp_pin_name2index(ptp, attr->attr.name);
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if (index < 0)
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return -EINVAL;
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if (mutex_lock_interruptible(&ptp->pincfg_mux))
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return -ERESTARTSYS;
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err = ptp_set_pinfunc(ptp, index, func, chan);
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mutex_unlock(&ptp->pincfg_mux);
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if (err)
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return err;
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return count;
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}
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int ptp_populate_pin_groups(struct ptp_clock *ptp)
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{
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struct ptp_clock_info *info = ptp->info;
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int err = -ENOMEM, i, n_pins = info->n_pins;
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if (!n_pins)
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return 0;
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ptp->pin_dev_attr = kcalloc(n_pins, sizeof(*ptp->pin_dev_attr),
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GFP_KERNEL);
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if (!ptp->pin_dev_attr)
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goto no_dev_attr;
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ptp->pin_attr = kcalloc(1 + n_pins, sizeof(*ptp->pin_attr), GFP_KERNEL);
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if (!ptp->pin_attr)
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goto no_pin_attr;
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for (i = 0; i < n_pins; i++) {
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struct device_attribute *da = &ptp->pin_dev_attr[i];
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sysfs_attr_init(&da->attr);
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da->attr.name = info->pin_config[i].name;
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da->attr.mode = 0644;
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da->show = ptp_pin_show;
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da->store = ptp_pin_store;
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ptp->pin_attr[i] = &da->attr;
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}
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ptp->pin_attr_group.name = "pins";
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ptp->pin_attr_group.attrs = ptp->pin_attr;
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ptp->pin_attr_groups[0] = &ptp->pin_attr_group;
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return 0;
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no_pin_attr:
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kfree(ptp->pin_dev_attr);
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no_dev_attr:
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return err;
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}
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void ptp_cleanup_pin_groups(struct ptp_clock *ptp)
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{
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kfree(ptp->pin_attr);
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kfree(ptp->pin_dev_attr);
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}
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